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What do you usually use mobile phones for? Sending text messages for fun? Playing games? Well, mobile phones can do far more than that.
During this year’s Asian tsunami (海啸), mobile phones saved many lives.
People were using more than 10,000 international phones when the tsunami hit.
Police sent text messages to them and found more than 2,000. But how? They followed the signal (信号) and found out where the tourists were.
So, how can something so small be so smart? Well, here’s how.
When you turn the phone on, it tries to find a signal. This signal comes from the telephone network. When the phone is finding a signal, it also sends a message to the telephone network. This message tells the station where the phone is.
When you start to make a phone call, the telephone network tells telecommunication (电信) offices where you are. The office will find out who you’re calling, then put you through to your friend. When you start to talk, a device (装置) in the phone changes your voice into electric signals. These signals travel across the telephone network and reach your friend’s phone. Then his phone changes the signals into your voice again. Finally, you can hear each other!
( )20. What’s the main idea of this passage? It tells us ______.
A. mobile phones are very useful and how they work
B. mobile phones saved all the lives during this year’s Asian tsunami
C. mobile phones can only be used to send text messages and play games
( ) 21. People were using ______ international phones when the tsunami hit.
A. more than 2,000 B. over 10,000 C. 8,000
( ) 22. From the passage, which sentence is TRUE?
A. When you start to make a phone call, the telephone network tells your friend where you are.
B. When you start to talk，a device in the telephone changes electric signals into your voice.
C. During this year’s Asian tsunami, police followed the signal and found out where the tourists were.
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